tmk_core/tool/mbed/mbed-sdk/libraries/dsp/cmsis_dsp/SupportFunctions/arm_copy_q15.c

   1 /* ----------------------------------------------------------------------
   2 * Copyright (C) 2010-2013 ARM Limited. All rights reserved.
   3 *
   4 * $Date:        17. January 2013
   5 * $Revision:    V1.4.1
   6 *
   7 * Project:          CMSIS DSP Library
   8 * Title:                arm_copy_q15.c
   9 *
  10 * Description:  Copies the elements of a Q15 vector.
  11 *
  12 * Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
  13 *
  14 * Redistribution and use in source and binary forms, with or without
  15 * modification, are permitted provided that the following conditions
  16 * are met:
  17 *   - Redistributions of source code must retain the above copyright
  18 *     notice, this list of conditions and the following disclaimer.
  19 *   - Redistributions in binary form must reproduce the above copyright
  20 *     notice, this list of conditions and the following disclaimer in
  21 *     the documentation and/or other materials provided with the
  22 *     distribution.
  23 *   - Neither the name of ARM LIMITED nor the names of its contributors
  24 *     may be used to endorse or promote products derived from this
  25 *     software without specific prior written permission.
  26 *
  27 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  28 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  29 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  30 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  31 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  32 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  33 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  34 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
  35 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  37 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  38 * POSSIBILITY OF SUCH DAMAGE.
  39 * -------------------------------------------------------------------- */
  40
  41 #include "arm_math.h"
  42
  43 /**
  44  * @ingroup groupSupport
  45  */
  46
  47 /**
  48  * @addtogroup copy
  49  * @{
  50  */
  51 /**
  52  * @brief Copies the elements of a Q15 vector.
  53  * @param[in]       *pSrc points to input vector
  54  * @param[out]      *pDst points to output vector
  55  * @param[in]       blockSize length of the input vector
  56  * @return none.
  57  *
  58  */
  59
  60 void arm_copy_q15(
  61   q15_t * pSrc,
  62   q15_t * pDst,
  63   uint32_t blockSize)
  64 {
  65   uint32_t blkCnt;                               /* loop counter */
  66
  67 #ifndef ARM_MATH_CM0_FAMILY
  68
  69   /* Run the below code for Cortex-M4 and Cortex-M3 */
  70
  71   /*loop Unrolling */
  72   blkCnt = blockSize >> 2u;
  73
  74   /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
  75    ** a second loop below computes the remaining 1 to 3 samples. */
  76   while(blkCnt > 0u)
  77   {
  78     /* C = A */
  79     /* Read two inputs */
  80     *__SIMD32(pDst)++ = *__SIMD32(pSrc)++;
  81     *__SIMD32(pDst)++ = *__SIMD32(pSrc)++;
  82
  83     /* Decrement the loop counter */
  84     blkCnt--;
  85   }
  86
  87   /* If the blockSize is not a multiple of 4, compute any remaining output samples here.
  88    ** No loop unrolling is used. */
  89   blkCnt = blockSize % 0x4u;
  90
  91
  92 #else
  93
  94   /* Run the below code for Cortex-M0 */
  95
  96   /* Loop over blockSize number of values */
  97   blkCnt = blockSize;
  98
  99 #endif /* #ifndef ARM_MATH_CM0_FAMILY */
 100
 101   while(blkCnt > 0u)
 102   {
 103     /* C = A */
 104     /* Copy and then store the value in the destination buffer */
 105     *pDst++ = *pSrc++;
 106
 107     /* Decrement the loop counter */
 108     blkCnt--;
 109   }
 110 }
 111
 112 /**
 113  * @} end of BasicCopy group
 114  */